AD7853AR-REEL

Overview

The AD7853AR-REEL is a 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 3 V to 5.5 V supply and supports throughput rates up to 200 kSPS. The device features a pseudo-differential input range of 0 V to VREF, with output coding available in straight binary or two's complement formats. Power consumption is typically 12 mW at 3 V in normal mode, dropping to 25 mW during automatic power-down after conversion. It includes self-calibration and system calibration capabilities, along with flexible serial interface modes compatible with SPI, QSPI, and 8051 systems.

Feature Summary

• Integrated track-and-hold amplifier acquires signals within 500 ns using a pseudo-differential sampling scheme.
• Supports on-chip self-calibration and system calibration to maintain accuracy over time and temperature variations.
• Features automatic power-down after conversion to minimize energy usage in battery-powered applications.
• Flexible serial interface allows compatibility with standard microprocessor protocols including SPI, QSPI, and 8051.

Applications

• Battery-powered personal digital assistants and mobile communication devices
• Medical instrumentation requiring low power consumption
• Pen computers and portable data acquisition systems
• Industrial instrumentation and control systems

Procurement Notes

Verify the specific grade (A or B) and package type (SOIC) when ordering, as performance specifications such as linearity error and operating temperature ranges vary between versions. Confirm that the REEL suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure the selected variant meets the required throughput and power dissipation constraints for the target application environment.

Selection Notes

Select the AD7853AR variant when higher speed operation up to 200 kSPS is required compared to the AD7853L. Consider the A-grade specification if operation across the full industrial temperature range of -40°C to +85°C is necessary. Evaluate the need for external reference voltage versus utilizing the internal 2.5 V reference capability provided by the REFOUT pin for system integration simplicity.

Part Context

This component belongs to the AD7853/AD7853L family of high-speed, low-power 12-bit ADCs. The AD7853 variant is optimized for maximum throughput speed, while the AD7853L version focuses on reduced power consumption. Both share identical pinouts and functional architectures, differing primarily in clock frequency limits and power metrics. The AR designation specifically identifies the Small Outline Integrated Circuit (SOIC) package configuration.

Replacement Considerations

The AD7853BR serves as a direct replacement offering the same SOIC package and 200 kSPS speed but with improved linearity specifications. For lower power requirements, the AD7853LAR provides a comparable footprint with optimized energy efficiency. Verify that any substitute maintains compatibility with the existing serial interface timing and calibration routines.